Modeling method of mathematical model used for predicting plastic pipeline aging tendency
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A mathematical model and plastic pipe technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of performance deterioration, loss of use value, easy aging, etc., to avoid losses, reduce production and operation costs, The effect of reducing the failure rate
Inactive Publication Date: 2014-08-27
ZHEJIANG INST OF QUALITY INSPECTION SCI
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[0002] Plastic pipes for construction have been popularized and applied in large quantities due to their many advantages, but plastic pipes, like other plastic products, also have the defect of being prone to aging. function, its performance gradually deteriorates, so that it finally loses its use value
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Embodiment 1
[0031] The modeling method of the mathematical model used to predict the aging trend of plastic pipes, the established indoor aging mathematical model of plastic pipes for construction is as follows:
[0032] Fn ( t ) = 100 * e [ A * t * ( W o * C o ) / ( W * C ) + δ ] --Formula 1)
[0033] In formula (1),
[0034] Fn(t): Tensile strength retention rate, in %;
[0035] t: Aging time, in hours;
[0036] W: temperature inf...
Embodiment 2
[0056] 1. Indoor natural aging test data
[0057] In order to facilitate the test and consider that the samples are representative, two kinds of PVC pipes with different filler contents were selected as the research objects to carry out the indoor natural aging test, and the corresponding tensile strength properties of each aging stage were tested respectively, and the following test data were obtained as shown in Table 3 shown.
[0058] Table 3 Indoor Natural Aging Tensile Strength Test Data
[0059]
[0060] 2. Establishment of mathematical model
[0061] Take W 0 = 1, C 0 =1; take e=2.718281828, δ=0.
[0062] Adopt nonlinear regression method, take A=-0.000009.
[0063] The following mathematical prediction model formula is obtained:
[0066] TSbn: Predicted value of tensile strength retention rate, in %;
[0067] tn: indoor natural aging time, in hours;
[0068] W: temperature infl...
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Abstract
The invention relates to the technology of analysis of building plastic pipeline aging performance, and discloses a modeling method of a mathematical model used for predicting a plastic pipeline aging tendency. The tensile strength conservation rate of a plastic pipeline is measured according to the determined temperature impact factor, the place impact factor and the time impact factor, and the index function relation between the tensile strength conservation rate and the temperature impact factor, the place impact factor and the time impact factor can be referred to in the instruction. According to the method, an indoor aging mathematical model formula has a smaller relative error value, the variation tendency of indoor natural aging tensile performance of plastic pipe materials used for buildings can be well fit, and the modeling method provides a good reference basis for predicting the plastic pipeline aging situation.
Description
technical field [0001] The invention relates to an analysis technology for the aging performance of building plastic pipes, in particular to a modeling method of a mathematical model for predicting the aging trend of plastic pipes. Background technique [0002] Plastic pipes for construction have been popularized and applied in large quantities due to their many advantages, but plastic pipes, like other plastic products, also have the defect of being prone to aging. function, its performance gradually deteriorates, so that it finally loses its use value. It is a very practical and complex problem to study the aging and anti-aging of plastic pipe polymer materials. Therefore, it is particularly important to establish a calculation method and a mathematical model suitable for the indoor aging performance analysis of plastic pipes used in buildings. Contents of the invention [0003] The purpose of the present invention is to provide a mathematical model modeling method for ...
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